SOUTH JORDAN — At Twenty One Run, a treadmill-only gym in South Jordan, they’re hosting a first-of-its-kind ultramarathon — testing both physical and mental limits. “There’s a race series called backyard ultras that have become very popular, so we decided to bring it inside and do an in-house ultra,” Sylvia Bedford, one of the owners of Twenty One Run said. The race began at 6 a.m. on Saturday with 18 competitors, each pushing themselves to run five miles every hour until the last man — or woman — is left standing. Read the full story at KSLTV.com: https://ksltv.com/?p=791298